Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e123182f4addd8…

MALICIOUS

PDF

74.5 KB Created: 2021-02-17 13:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2390fb6085b3aaf7ebfe017c4d315c05 SHA-1: 26ef93fb8dcac169d51f3c98fa07ba8d48e23a2a SHA-256: 99e123182f4addd882ba6614abca97ee6cdc8b27d20741a73064283ee63bd392
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector link farm and a phishing trojan. The document contains numerous embedded URLs pointing to external PDF files, many hosted on disposable domains, suggesting an attempt to distribute malware or engage in phishing. The presence of a link to 'yafferge.ru' with a 'you can't make this up meme' parameter further indicates a deceptive intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=you+can%2527t+make+this+up+meme In PDF document text
    • https://cdn.sqhk.co/pajerelo/ghjguTm/58411070058.pdfIn PDF document text
    • https://devivevapidon.weebly.com/uploads/1/3/4/7/134711806/zudamifab.pdfIn PDF document text
    • http://blockhcain.host/tiduvagitaxenijigisoneroo2kor.pdfIn PDF document text
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/4e23e.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/kevetuzo.pdfIn PDF document text
    • https://veximukexapi.weebly.com/uploads/1/3/0/9/130969798/1799832.pdfIn PDF document text
    • https://datipozor.weebly.com/uploads/1/3/0/8/130813945/jasatorabafusuxab.pdfIn PDF document text
    • https://tupefumezamubew.weebly.com/uploads/1/3/0/8/130874634/tagib.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/4243480.pdfIn PDF document text
    • https://mozufakumijisa.weebly.com/uploads/1/3/5/3/135333945/noverefomifo_pasiter_noloxesexow_zalexefox.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/bexek-xumajokelufum-kerudifofa-delakine.pdfIn PDF document text
    • https://pefisidedufe.weebly.com/uploads/1/3/4/9/134902532/xirofe_muvejotu.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/9360772.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/hhcieYv/vlc_android_playlist_repeat.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/pizewebejabuxije.pdfIn PDF document text
    • https://lerinaxupol.weebly.com/uploads/1/3/4/6/134662503/6098477.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/kabijewa.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/9844731.pdfIn PDF document text
    • https://lerasakob.weebly.com/uploads/1/3/2/6/132682990/4269378.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 5104 bytes
SHA-256: 1c1a3df8930244b59ac7c7a4c6e8e72d61624100f3d492cf62a1938d2025c734
font_01_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 10700 bytes
SHA-256: e07eeedcc8e0dbdf1b728239767cc6a6649cc37dd18c90b27c338660e1af62df